After adding basically a 100% RDA vitamin and a fish oil pill, many of them reported being amazed to discover having self control for the first time in their lives.

even worse because of the compounding frustration and lack of understanding for why coupled with the feeling of not having eaten a proper, hunger satiating meal.

In the case of the current prison population, it is even worse than that because they are simply assumed to be violent, maladjusted etc and no one at all wonders if their health impacts it, even in cases where they have a diagnosis of being HIV positive or having TB. When a middle class person is having a health crisis and acts out, the odds are good that people will cut them some slack and hope they feel better soon. When a prisoner does so, hey, he is just a criminal with no redeeming value and we should lock him up and throw away the key.

Of course this has to be against all sorts of laws and conventions so I doubt it's publicly traded knowledge but the whole idea reminds me of the grey area psychologists and interrogation specialists tend to talk about when topics like water boarding and other torture / effective interrogation methods are questioned.

Using food as something that can be modified to achieve a desired behavior is not a new thing. Applying scientific methods to it is more recent.